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To clarify: the staging problem with my Infinity control ONLY occurs in cooling mode. Runs in high most of the time in the spring and summer. It is hot here.. Location: New Orleans,LA. Cooling degree days 2000+. Seems to run in high all of the time when temperature is greater than 85 degrees. Average humidity here is 80%+. ACDJR wire disconnected to allow infinity control to control staging as directed in the install manual. High cool latch set to 95 degrees. I can tell it is in high from the stat and the circuit board on the condensing unit. Dealer is clueless. Carrier tech support clueless. Paid an energy auditor to survey the house--test, run manual J, blower door test. She was clueless too as to why the unit ran in high all the time. Our utility bills were HIGHER than when we had 8 SEER unit. This unit is 16.5 SEER, 2 stage 38TDB w/ txv valve. Coils were clean (both), filter changed, superheat, refrigerant charge correct. Temperature differential across evaporator coil 20 degrees in high stage and about 12-14 in low stage. Perhaps Casper the friendly ghost has possessed our unit or gremlins. Perhaps I have a black hole that opens and lets warm air in while I am not looking? Nobody knows.

I want to just ignore this problem but I paid a fortune for this system and I want it to work correctly.

Strangely, the infinity control works flawlessly and seamlessly in heating mode. Starts in low fire, runs for ten minutes then goes to high fire, if needed. High fire only necessary when coming out of night setback or if it is below about 35-37 degrees. Low fire can mantain 68 degrees unless it is below about 36 degrees then high fire kicks in for brief periods.

If I had a single stage stat, as one helpful person suggested, then the furnace circuit board would do the staging based on "stored history of past cycles". Professionals on this site have the consensus that this is a poor staging and temp control. Although, I have no doubt that it may work for some systems, as someone reported.

A more pressing problem now though. It is soooo dry in here. Humidity is 19%!! target humidity=45%, humidifier on. I have a bypass humidifier installed for those 14 days or so that we need humidity added (like today) Outdoor humidity is 46%. Humidifier is correctly installed, working perfectly: open bypass, correct stat settings, adjusted low stage airflow, solenoid switch works flawlessly, water flows and drains, turns on and off manually in the "checkout" mode with advanced service mode. Stat says the humidifier is on and it is. Just not adding humidity. Outdoor temp is 40 degrees presently (daytime) upper 20's at night and windy 14mpg gusting to 22 mph.

Thanks. Good thing you asked about this because I cannot access the service bullitins. It requires a password on the carrier website.
Model number (furnace) is 58CVA070-1-12, condenser is 38tdb036. Infinity Control user interface systxccuid01. evap coil is ce3axa036. Any help you give would be much appreciated.

I think I figured out about the humidifier not working properly. My home doesn't have a vapor barrier! I came across some literature indicating that a vapor barrier is key. I have one in the attic but not in walls.

They may have it set to "latch"(high speed above a certain outdoor temp).This may be set too low or more likely they didn't locate the sensor(thermister) correctly.It's likely still inside the outdoor unit or located so the sun hits it.

Have them check the location.You can check to see how accurate it is today,but it may be different in the summer ,if not located properly.

Latch is set at 95 degrees. Thermisistor comes from the factory hanging straight off the inside access panel with a plastic tie. It remains there now.

It seems to me that it would read a "false high" temperature here from the heat of the compressor and condensing unit coils. We read the install manual and where to place it is not really clear. Outside the unit--where? Where would you put it if it was your unit? I will call them out again to locate it where you suggest.

We place are thermisters' on both Ac & HP models under the left side outside eve. Strap the sensor wire to the electric whip. Face the sensor tip up and slihtly dangling.

We use a computer APM software attach to our labtops. High capacity readings where showing on all our two stage equipment. Feild tested the units and all worked in low capacity. Computer & controller showed run time in high capacity only. The ACDJR jumper must remain plugged in when using infinity contollers.

Originally posted by dash They may have it set to "latch"(high speed above a certain outdoor temp).This may be set too low or more likely they didn't locate the sensor(thermister) correctly.It's likely still inside the outdoor unit or located so the sun hits it.

Have them check the location.You can check to see how accurate it is today,but it may be different in the summer ,if not located properly.

Re: ACDJR...

should it be disconnected on my Infinity system? My dealer and I cannot find any literature that indicates it should or should not. There IS literature that says it should be disconnected if you want the thermostat or thermidistat to control staging for cooling. But what about for an Infinity control, 38tdb condensing unit, 58cva furnace? We removed the jumper when I had the thermidistat as the literature indicates. Should it be replaced when I upgraded to the Infinity control?

We looked at the setup for the control under advanced functions. It is set to have the system control staging. Is this sufficient or do I need to replace that acdjr jumper or leave it where it is (removed)? THANKS FOR YOUR HELP!